It is true that there are only four RIDES now in HS: Rock & Roller Coaster, Star Tours, Tower of Terror, and Toy Story Mania. IMO, these are four of the best rides in all of WDW. I believe that quite a few PP agree with me, although some do not like thrill rides.
If I am touring alone, I want to see the following shows: Beauty & the Beast, Frozen Sing Along (this is new since last time I was there), Indiana Jones, Voyage of the Little Mermaid, Muppet Vision 3D, One Mans Dream, Fantasmic, Star Wars Fireworks (this is also new for me, and I'm not sure if you can see this and Fantasmic). First Order March (also new) and Jedi Training are/seem to be the type of shows that I would watch if I happen to be in the right place at the right time. DW and I watched Jedi Training while in line for Star Tours.
I realize that there are some shows I have not mentioned, which I may or may not see. I have only listed the ones that I WANT to see myself. Certainly if you have small children I think they should have the chance to see Disney Junior, for example, but unless I have a small child in the party it isn't at the top of my list.
50s Prime Time is probably my favorite restaurant in WDW if I had to pick only one (but I have several favorites so I don't want to pick only one). I am looking forward to trying Sci Fi Dine this year. The last time I was there, HS was the only park to approach Epcot on dining from a FOOD perspective. I understand that MK and AK have made progress in this area.
HS is and has always been primarily a SHOW park rather than a RIDE park. In fact, the only two rides that have closed are Backlot Tour and Great Movie Ride. I never skipped either. I considered Great Movie Ride one of my favorites. Yet cutting from six rides to four IMO is not enough to reduce a "full day park" to a "half day park". If you have never been to WDW, or if you haven't been for awhile, there is plenty to do at HS. People who don't like shows, or who have seen these shows and don't want to see them again, may find little to do here. If you know what you like, you know what you want to do. If you are really new, don't overlook this park.